Ketamine is a kind of anesthetic broadly applied in clinic. However, growing evidence has indicated that ketamine may induce neurotoxicity. Previous studies showed that mircoRNAs (miRNAs) participate in various aspects of biological regulations. In our work, we aimed to reveal the role of miR-429 in ketamine-induced neurotoxicity. The qRT-PCR was used to measure the miR-429 levels in ketamine-treated PC12 cells. TUNEL staining and caspase 3 activity detection assays were performed to assess cell apoptosis. A Cellular Reactive Oxygen Species Detection Assay Kit was utilized to detect ROS activity. A luciferase reporter assay was conducted in HEK-293T cells to test the binding between miR-429 and BAG5. Herein, we found that ketamine could induce the apoptosis and ROS activity in PC12 cells. The qRT-PCR results showed that miR-429 expression was downregulated by treatment of ketamine in a dose-dependent manner. Overexpression of miR-429 alleviated ketamine-induced neurotoxicity in PC12 cells. Mechanically, BAG5 was identified to be a target of miR-429 and negatively regulated by miR-429. Moreover, BAG5 expression was upregulated after ketamine treatment. Rescue assays revealed that overexpression of BAG5 reversed the suppressive effects of miR-429 upregulation on ketamine-induced neurotoxicity in PC12 cells. In summary, miR-429 attenuates ketamine-induced neurotoxicity in PC12 cells by the downregulation of BAG5.
Keywords: BAG5; apoptosis; ketamine; miRNA-429; neurotoxicity.
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